A UL-approved fiberglass plenum box with ceiling radiation damper (CRD) is available in three model styles. The fiberglass plenum boxes are offered in 1- and 1-1/2-inches-thick rigid ductboard with ...

Bathroom exhaust fans are the most common way to properly ventilate and control moisture in residential bathrooms. Along with providing effective ventilation, bath fans with a ceiling radiation damper ...

There are five essential dampers types: ceiling radiation, fire, corridor dampers, smoke, and combination fire and smoke. This article will cover the three types that are required per Chapter 7 of the ...